Yes it is, and they are awesome. git-crypt[0] is a godsend for smaller projects (and maybe larger ones if permissions are granular enough) -- way simpler than sops[1] and other alternative, with native integration via git filters (smudge). I use it on a ton of projects.
[0]: https://www.agwa.name/projects/git-crypt/
[1]: https://github.com/mozilla/sops